JP5132187B2 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

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JP5132187B2
JP5132187B2 JP2007133124A JP2007133124A JP5132187B2 JP 5132187 B2 JP5132187 B2 JP 5132187B2 JP 2007133124 A JP2007133124 A JP 2007133124A JP 2007133124 A JP2007133124 A JP 2007133124A JP 5132187 B2 JP5132187 B2 JP 5132187B2
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ring
exhaust
exhaust gas
shaped member
opening
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JP2008286134A (en
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美和 林
武司 宮本
史宏 黒木
武文 望月
喜美子 瀬戸
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UD Trucks Corp
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UD Trucks Corp
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Priority to JP2007133124A priority Critical patent/JP5132187B2/en
Priority to US12/600,799 priority patent/US8375703B2/en
Priority to EP08721165.2A priority patent/EP2151560B1/en
Priority to PCT/JP2008/053745 priority patent/WO2008142893A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/208—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/22—Inlet and outlet tubes being positioned on the same side of the apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

本発明は、内燃機関の排気浄化装置に関し、特に、途中に折返部を有する排気通路を備え、還元剤を用いて排気ガス中のＮＯXを還元除去する内燃機関の排気浄化装置に関する。 The present invention relates to an exhaust gas purification apparatus for an internal combustion engine, and more particularly to an exhaust gas purification apparatus for an internal combustion engine that includes an exhaust passage having a turning portion in the middle and reduces and removes NO x in exhaust gas using a reducing agent.

従来、ディーゼルエンジン等の内燃機関から排出される排気ガス中に含まれる粒子状物質（以下、ＰＭと称する）や窒素酸化物（以下、ＮＯXと称する）を除去するための技術が知られている。
このうち、ＮＯXを除去するための技術として、排気通路中に配置されたＮＯX触媒の上流側で還元剤を噴射し、排気ガスとともにＮＯX触媒に流入させて、排気ガス中のＮＯX（ＮＯやＮＯ2）を窒素等に効率的に分解して放出する選択還元型（ＳＣＲ：Selective Catalytic Reduction）の排気浄化装置が知られている。 Conventionally, the particulate matter contained in exhaust gas discharged from an internal combustion engine such as a diesel engine (hereinafter, referred to as PM) and nitrogen oxides (hereinafter, referred to as NO X) are known techniques for removing Yes.
Among them, as a technique for removing NO X, injecting a reducing agent upstream of the NO X catalyst arranged in the exhaust passage, by flowing to the NO X catalyst together with the exhaust gas, NO X in the exhaust gas A selective reduction type (SCR: Selective Catalytic Reduction) exhaust purification device that efficiently decomposes and releases (NO or NO 2 ) into nitrogen or the like is known.

このような排気浄化装置の一態様として、排気中のＮＯX浄化機能を備え、内部で排気流れ方向を強制的に折り返す構造の消音装置が提案されている。より具体的には、図８に示すように、上流側排気通路４０９に、酸化触媒４１１と液体還元剤を噴射供給する噴射ノズル４１２を配置し、下流側排気通路４１０に、ＮＯX還元触媒４１３と還元剤酸化触媒４１４を配置し、折返部４０８に、孔４１５ａを周囲に設けたリング部材４１５を設け、孔４１５ａから排気を下流側に流して折返部壁面４０８ａに沿った排気流れを発生させて折返部４０８の鉛直面に渦を生成するようにした排気浄化機能付き消音装置４０１が開示されている（特許文献１参照）。 One aspect of such an exhaust purification device, comprising a NO X purification function of the exhaust, the noise suppressor of the forcibly folded structure of the exhaust flow direction internally has been proposed. More specifically, as shown in FIG. 8, an injection nozzle 412 for injecting and supplying the oxidation catalyst 411 and the liquid reducing agent is disposed in the upstream exhaust passage 409, and the NO x reduction catalyst 413 is disposed in the downstream exhaust passage 410. And a reducing agent oxidation catalyst 414 are disposed, and a ring member 415 provided with a hole 415a is provided in the folded portion 408, and exhaust gas flows through the hole 415a downstream to generate an exhaust flow along the folded portion wall surface 408a. Thus, there is disclosed a silencer 401 with an exhaust purification function that generates vortices on the vertical surface of the folding portion 408 (see Patent Document 1).

特開２００５−２７３５８０号公報 （特許請求の範囲 図１）JP 2005-273580 A (Claims Fig. 1)

ところで、特許文献１に記載された消音装置の構成の場合、上流側の排気通路を通過した排気ガスが折返部に流入すると、急激に空間が広がるために折返部内での流速は遅くなってしまう。そのため、排気通路中に供給された還元剤と排気ガスとが十分に混合されにくくなるとともに下流側排気通路へ流入する排気ガスの分布にばらつきが生じる結果、ＮＯX触媒に供給される還元剤の分布にばらつきが生じてしまう。したがって、ＮＯX触媒でのＮＯXの浄化効率が低下するおそれがあった。 By the way, in the case of the structure of the silencer described in Patent Document 1, when the exhaust gas that has passed through the upstream exhaust passage flows into the folded portion, the space rapidly expands and the flow velocity in the folded portion becomes slow. . Therefore, as a result of variations in the distribution of the exhaust gas flowing with the supplied reducing agent and exhaust gas is less likely to be well mixed in the exhaust passage to the downstream side exhaust passage, the reducing agent supplied to the NO X catalyst The distribution will vary. Accordingly, purification efficiency of the NO X in the NO X catalyst may decrease.

還元剤と排気ガスとを十分に混合するためには、折返部内に多孔板等の拡散手段を設けることが考えられるが、拡散手段の配置によっては拡散手段が排気ガスの流れを妨げる結果となり、大部分の排気ガスが拡散手段を通過することなく下流側の排気通路に流れ込むおそれがある。   In order to sufficiently mix the reducing agent and the exhaust gas, it is conceivable to provide a diffusion means such as a perforated plate in the folded portion, but depending on the arrangement of the diffusion means, the diffusion means results in hindering the flow of exhaust gas, There is a risk that most of the exhaust gas flows into the downstream exhaust passage without passing through the diffusion means.

そこで、本発明の発明者らは鋭意努力し、排気通路に折返部を有する排気浄化装置において、折返部を形成する本体部及び蓋部の少なくとも一方に所定のガイド部（ガイド板、遮蔽板）及び還元剤拡散部（拡散板）を設けることにより、このような問題を解決できることを見出し、本発明を完成させたものである。すなわち、本発明の目的は、排気通路の折返部を有しコンパクトにされた排気浄化装置において、下流側の排気通路に配置されたＮＯX触媒に対して、還元剤を拡散させて流入させることができる排気浄化装置を提供することである。 Accordingly, the inventors of the present invention have made diligent efforts, and in an exhaust purification device having a folded portion in the exhaust passage, a predetermined guide portion (guide plate, shielding plate) is provided on at least one of the main body portion and the lid portion forming the folded portion. In addition, the present inventors have found that such a problem can be solved by providing a reducing agent diffusion part (diffusion plate) and completed the present invention. An object of the present invention is that in the exhaust purification apparatus that is compact has a turned-back portion of the exhaust passage, with respect to NO X catalyst arranged in an exhaust passage downstream, to flow to diffuse the reducing agent It is an object of the present invention to provide an exhaust purification device that can perform the above-mentioned.

本発明によれば、折返部を有する排気通路と、折返部又は折返部よりも上流側の排気通路に配置され排気通路中に還元剤を供給する還元剤供給部と、折返部よりも下流側の排気通路に配置され窒素酸化物を還元剤を用いて還元浄化する還元触媒と、を備えた排気浄化装置であって、排気浄化装置の筐体は、上流側の排気通路及び下流側の排気通路が収容された本体部と、上流側の排気通路の出口側開口及び下流側の排気通路の入口側開口が設けられた本体部に装着された蓋部と、を含み、折返部は本体部及び蓋部によって囲まれる空間からなっており、蓋部内の出口側開口を含む面、又は当該面と対向する蓋部内面に、開口部を有する第１のリング状部材、開口部を有する第２のリング状部材、第１のガイド板、第２のガイド板、及び拡散板を接触して備えることを特徴とするともに、またさらに、上流側の排気通路の出口側開口に連接して設置される第１のリング状部材、下流側の排気通路の入口側開口に連接して設置される第２のリング状部材、第１のリング状部材の開口部から流出される排気ガスを拡散板に導く第１のガイド板、拡散板を通過した排気ガスを第２のリング状部材の開口部に導く第２のガイド板、及びガイド板によって導かれる排気ガスの流れを排気ガス中への還元剤の混合を促進させる拡散板と、を備えることを特徴とする排気浄化装置が提供され、上述した問題を解決することができる。 According to the present invention, the exhaust passage having the folded portion, the reducing portion supplying the reducing agent in the exhaust passage disposed upstream of the folded portion or the folded portion, and the downstream side of the folded portion And a reduction catalyst for reducing and purifying nitrogen oxides using a reducing agent, wherein the exhaust purification device has a housing on the upstream side and an exhaust on the downstream side. A main body portion in which the passage is accommodated, and a lid portion attached to the main body portion provided with the outlet side opening of the upstream exhaust passage and the inlet side opening of the downstream exhaust passage, and the folding portion is the main body portion And a first ring-shaped member having an opening on the surface including the outlet side opening in the lid, or the inner surface of the lid facing the surface, and the second having an opening. Ring-shaped member, first guide plate, second guide plate, and diffusion plate A first ring-shaped member installed in connection with the outlet side opening of the upstream exhaust passage, and further connected to the inlet side opening of the downstream exhaust passage. Second ring member to be installed, first guide plate for guiding exhaust gas flowing out from the opening of the first ring member to the diffusion plate, exhaust gas passing through the diffusion plate to the second ring member And a diffusion plate for promoting the mixing of the reducing agent into the exhaust gas. Thus, the above-described problem can be solved.

また、本発明の排気浄化装置を構成するにあたり、蓋部における排気ガスの流れが、上流側の排気通路から出口側開口を経て、第１のリング状部材に流入し、第１のリング状部材の開口部を経て流出し、第１のガイド板により導かれて拡散板を通過した後、第２のガイド板により導かれて第２のリング状部材の開口部に達し、開口部を経て第２のリング状部材に流入し、第２のリング状部材から下流側の排気通路の入口側開口を経て、下流側の排気通路に流入することが好ましい。 Further, when configuring the exhaust emission control device of the present invention, the flow of the exhaust gas in the lid portion flows from the upstream exhaust passage through the outlet side opening into the first ring-shaped member, and the first ring-shaped member After flowing through the opening of the first guide plate, passing through the diffusion plate after being guided by the first guide plate, reaching the opening of the second ring-shaped member by being guided by the second guide plate, and passing through the opening. It is preferable that the gas flows into the second ring-shaped member and flows into the downstream exhaust passage from the second ring-shaped member through the inlet-side opening of the downstream exhaust passage .

また、本発明の排気浄化装置を構成するにあたり、還元剤供給部は折返部内の拡散板の上流側に配置するとともに、第１のリング状部材と蓋部の外周部との間を塞ぎ、第１のリング状部材から流出した排気ガスを、第２のリング状部材の開口部に導く第３のガイド板を含むことが好ましい。 Further, in configuring the exhaust emission control device of the present invention, the reducing agent supply unit is disposed on the upstream side of the diffusion plate in the folding unit, and the gap between the first ring-shaped member and the outer peripheral part of the lid unit is closed, It is preferable to include a third guide plate that guides exhaust gas flowing out from one ring-shaped member to the opening of the second ring-shaped member .

また、本発明の排気浄化装置を構成するにあたり、排気ガスの流れの途中に配置され、排気ガスを拡散板に均一に導くための整流板を含むことが好ましい。 In configuring the exhaust emission control device of the present invention, it is preferable to include a rectifying plate that is disposed in the middle of the flow of the exhaust gas and uniformly guides the exhaust gas to the diffusion plate .

また、本発明の排気浄化装置を構成するにあたり、第１のリング状部材が連接する上流側の排気通路の出口側開口と、第２のリング状部材が連接する下流側の排気通路の入口側開口が蓋部断面図の矩形領域の対角に位置するように配置することが好ましい。 Further, in configuring the exhaust emission control device of the present invention, the outlet side opening of the upstream exhaust passage where the first ring-shaped member is connected and the inlet side of the downstream exhaust passage where the second ring-shaped member is connected It is preferable to arrange so that the opening is located at the diagonal of the rectangular area of the lid section view.

本発明によれば、排気通路が途中で折り返されて装置全体の小型化が図られた排気浄化装置において、折返部を形成する本体部の面又は蓋部の面の少なくとも一方に備えられた所定のガイド部によって、折返部に流入した排気ガスの流速の低下を低減しつつ、下流側排気通路へと導くことができる。また、ガイド部によって導かれる排気ガスの流れの途中に還元剤拡散部が配置されていることによって、還元剤の混合を促進させることができる。したがって、下流側の排気通路に配置されたＮＯX触媒に対して、還元剤を拡散させて流入させやすくなり、ＮＯXの浄化効率を向上させることができる。
また、本体部及び蓋部によって囲まれる空間によって折返部が形成される構成であるために、ガイド部及び還元剤拡散部を折返部内に容易に配置することができる。
また、上流側排気通路の出口側開口には、周方向に複数の開口部としての孔を有する第１のリング状部材を備えることにより、当該孔を介して上流側排気通路から折返部に流入する排気ガスの流れ方向を規定する。
また、下流側排気通路の入口側開口には、第２のリング状部材を備えることにより、折返部から下流側排気通路に排気ガスを流入させる。
また、排気ガスを拡散板に導く第１のガイド板を備えることにより、排気ガスを還元剤拡散部を通過させて、還元剤の気化混合を促進させることができる。
さらに、拡散板を通過した排気ガスを下流側の排気通路に導く第２のガイド板を備えることにより、供給された還元剤がＮＯ X 触媒以外の領域に入り込んで付着しないように排気ガスを導くことができる。 According to the present invention, in the exhaust gas purification apparatus in which the exhaust passage is folded back to reduce the size of the entire apparatus, the predetermined part provided on at least one of the surface of the main body part or the cover part forming the folded part. With this guide part, it is possible to guide to the downstream exhaust passage while reducing the decrease in the flow rate of the exhaust gas flowing into the folded part. Moreover, mixing of the reducing agent can be promoted by disposing the reducing agent diffusion portion in the middle of the flow of the exhaust gas guided by the guide portion. Therefore, it becomes easy to diffuse the reducing agent into the NO x catalyst disposed in the downstream exhaust passage and improve the NO x purification efficiency.
In addition, since the folded portion is formed by the space surrounded by the main body portion and the lid portion, the guide portion and the reducing agent diffusing portion can be easily arranged in the folded portion.
In addition, the outlet side opening of the upstream side exhaust passage is provided with a first ring-shaped member having holes as a plurality of openings in the circumferential direction, so that it flows from the upstream side exhaust passage into the folded portion through the hole. Define the flow direction of exhaust gas.
In addition, the opening on the inlet side of the downstream exhaust passage is provided with a second ring-shaped member, so that the exhaust gas flows into the downstream exhaust passage from the folded portion.
In addition, by providing the first guide plate that guides the exhaust gas to the diffusion plate, the exhaust gas can be passed through the reducing agent diffusing section to promote vaporization and mixing of the reducing agent.
Furthermore, by providing a second guide plate that guides the exhaust gas that has passed through the diffusion plate to the exhaust passage on the downstream side, the exhaust gas is guided so that the supplied reducing agent does not enter and adhere to a region other than the NO x catalyst. be able to.

また、本発明によれば、第１のリング状に流入した排気ガスは第１のリング状部材の複数の孔から折返部に流れ込み、拡散板に向かって進行する。そして、拡散板の上流側で還元剤が還元剤供給部から排気ガス中に噴射供給され、この還元剤が混合された排気ガスが拡散板を通過する。その後、排気ガスが第２のリング状部材の開口部を介して下流側排気通路に導かれる結果、下流側排気通路中に配設されたＮＯFurther, according to the present invention, the exhaust gas flowing into the first ring shape flows into the folded portion from the plurality of holes of the first ring-shaped member, and proceeds toward the diffusion plate. Then, the reducing agent is injected and supplied into the exhaust gas from the reducing agent supply unit on the upstream side of the diffusion plate, and the exhaust gas mixed with the reducing agent passes through the diffusion plate. After that, the exhaust gas is led to the downstream exhaust passage through the opening of the second ring-shaped member, and as a result, the NO disposed in the downstream exhaust passage. XX 還元触媒に対して還元剤を拡散させて流入させることができるようになっている。The reducing agent can be diffused and introduced into the reduction catalyst.

また、本発明によれば、第３のガイド板を備えることによって、第１のリング状部材の複数の孔を介して折返部に流入した排気ガスの流れが、下流側排気通路の入口側開口に配設された第２のリング状部材の開口部が臨む領域に向けられるようになっている。In addition, according to the present invention, by providing the third guide plate, the flow of the exhaust gas that has flowed into the folded portion through the plurality of holes of the first ring-shaped member is allowed to enter the opening on the inlet side of the downstream exhaust passage. The opening of the second ring-shaped member disposed in the is directed to the region facing the opening.

また、本発明の排気浄化装置において、排気ガスの流れの途中に所定の整流板を備えることにより、排気ガスの流速が均一化され、還元剤拡散部に対して排気ガスを均一に流入させることができる。 Further, in the exhaust purification apparatus of the present invention, by providing a predetermined rectifying plate in the middle of the exhaust gas flow, the exhaust gas flow velocity is made uniform, and the exhaust gas flows uniformly into the reducing agent diffusion portion. Can do.

以下、図面を参照して、本発明の排気浄化装置に関する実施形態について具体的に説明する。ただし、かかる実施形態は、本発明の一態様を示すものであり、この発明を限定するものではなく、本発明の範囲内で任意に変更することが可能である。
なお、それぞれの図中、同一の符号が付されているものについては同一の部材を表しており、適宜説明が省略されている。 Hereinafter, embodiments of the exhaust emission control device according to the present invention will be specifically described with reference to the drawings. However, this embodiment shows one aspect of the present invention and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention.
In addition, in each figure, what is attached | subjected with the same code | symbol represents the same member, and description is abbreviate | omitted suitably.

１．排気浄化装置（消音装置）
図１は、本発明の実施の形態にかかる排気浄化装置１０の内部構造の一例を示しており、排気浄化機能を持った消音装置として構成されたものとなっている。
この排気浄化装置１０は、本体部１２と蓋部１１とによって筐体が構成され、全体として角型の排気浄化装置１０となっている。筐体の外周囲には、排気浄化装置１０を車両に固定するためのフランジ部１５ａが複数設けられている。また、本体部１２及び蓋部１１にはそれぞれ取付フランジ部１５ｂ、１５ｃが設けられ、本体部１２と蓋部１１とが図示しないネジ等を用いて固定されている。 1. Exhaust purification device (silencer)
FIG. 1 shows an example of the internal structure of an exhaust purification device 10 according to an embodiment of the present invention, which is configured as a silencer having an exhaust purification function.
The exhaust gas purification apparatus 10 includes a main body portion 12 and a lid portion 11 to form a casing, and is a square exhaust gas purification device 10 as a whole. A plurality of flange portions 15a for fixing the exhaust purification device 10 to the vehicle are provided on the outer periphery of the housing. Further, the main body portion 12 and the lid portion 11 are provided with mounting flange portions 15b and 15c, respectively, and the main body portion 12 and the lid portion 11 are fixed using screws or the like (not shown).

このうち、本体部１２の側面（図中右側の面）１２ａに排気流入部１３及び排気排出部１４（図中、２点鎖線で示す）が設けられている。また、本体部１２の内部には、排気流入部１３に形成した多数の孔１６を介して排気流入部１３と連通する拡張室１７と、当該拡張室１７が配置された側の側面１２ａと反対側の側面１２ｂで排気ガスの流れを折返す折返部１８と、拡張室１７と折返部１８とを連通する上流側排気通路１９と、折返部１８と排気排出部１４とを連通する下流側排気通路２０とが形成されている。折返部１８は、本体部１２の側面１２ｂと蓋部１１の内面１１ａとによって囲まれる空間からなり、上流側排気通路１９を介して流れ込む排気ガスの拡張室としての機能も有している。
このように排気通路が折り返されていることによって、排気浄化装置１０の全長が短くされ、装置全体の小型化が図られている。 Among these, an exhaust inflow portion 13 and an exhaust discharge portion 14 (indicated by a two-dot chain line in the drawing) are provided on a side surface (right side surface in the drawing) 12 a of the main body portion 12. Further, inside the main body 12, an expansion chamber 17 that communicates with the exhaust inflow portion 13 through a large number of holes 16 formed in the exhaust inflow portion 13, and a side surface 12 a on the side where the expansion chamber 17 is disposed is opposite. The exhaust gas flow at the side surface 12b on the side, the upstream exhaust passage 19 that communicates the expansion chamber 17 and the folding portion 18, and the downstream exhaust gas that communicates the folding portion 18 and the exhaust discharge portion 14. A passage 20 is formed. The folded portion 18 is a space surrounded by the side surface 12 b of the main body portion 12 and the inner surface 11 a of the lid portion 11, and also has a function as an expansion chamber for exhaust gas flowing through the upstream side exhaust passage 19.
By folding the exhaust passage in this way, the overall length of the exhaust purification device 10 is shortened, and the overall size of the device is reduced.

上流側排気通路１９には、上流側酸化触媒２１及びパティキュレートフィルタ２６が配設されている。パティキュレートフィルタ２６は、排気ガス中に含まれる黒煙微粒子等のパティキュレートを捕集するためのものであり、上流側酸化触媒２１の下流側に配設されている。また、上流側酸化触媒２１は、排気ガス中の未燃燃料（ＨＣ）や一酸化炭素（ＣＯ）、ＮＯを酸化させたり、パティキュレートフィルタ２６の再生時に排気ガスを昇温させたりするために用いられるようになっている。また、下流側排気通路２０には、ＮＯX還元触媒２３及び下流側酸化触媒２４が配設されている。ＮＯX還元触媒２３は、排気ガス中に含まれるＮＯXを還元剤により還元浄化するために用いられる。また、下流側酸化触媒２４は、ＮＯX還元触媒２３を通過した還元剤を酸化浄化するために用いられ、ＮＯX還元触媒２３の下流側に配設されている。
これらの上流側酸化触媒２１、下流側酸化触媒２４、パティキュレートフィルタ２６及びＮＯX還元触媒２３については、それぞれ公知のものを使用することができる。 An upstream side oxidation catalyst 21 and a particulate filter 26 are disposed in the upstream side exhaust passage 19. The particulate filter 26 is for collecting particulates such as black smoke particulates contained in the exhaust gas, and is disposed on the downstream side of the upstream oxidation catalyst 21. Further, the upstream side oxidation catalyst 21 oxidizes unburned fuel (HC), carbon monoxide (CO), and NO in the exhaust gas, and raises the temperature of the exhaust gas when the particulate filter 26 is regenerated. It has come to be used. The downstream exhaust passage 20 is provided with a NO x reduction catalyst 23 and a downstream oxidation catalyst 24. The NO X reduction catalyst 23 is used for reducing and purifying NO X contained in the exhaust gas with a reducing agent. The downstream side oxidation catalyst 24 is used to oxidize purifying reducing agents flowing through the NO X reduction catalyst 23, disposed on the downstream side of the NO X reduction catalyst 23.
These upstream oxidation catalyst 21, the downstream side oxidation catalyst 24, the particulate filter 26 and NO X reduction catalyst 23 can be respectively used known ones.

また、折返部１８には、図示しないガイド部及び拡散板が配置されるとともに、例えば尿素水溶液や未燃燃料等の液体還元剤を噴射供給する還元剤供給部２２が配設されている。この還元剤供給部２２は、エアアシスト式の還元剤供給装置に接続された噴射ノズルや圧送される還元剤を直接噴射する還元剤噴射弁からなり、拡散板の上流側で還元剤が噴射供給されるようになっている。還元剤供給部２２の配置位置については特に制限されるものではないが、排気ガス中への還元剤の拡散効率を考慮して配置することが好ましい。   In addition, a guide portion and a diffusion plate (not shown) are disposed in the folding portion 18, and a reducing agent supply portion 22 that injects and supplies a liquid reducing agent such as an aqueous urea solution or unburned fuel is disposed. The reducing agent supply unit 22 includes an injection nozzle connected to an air assist type reducing agent supply device and a reducing agent injection valve that directly injects the reducing agent to be pumped, and the reducing agent is supplied and supplied upstream of the diffusion plate. It has come to be. The arrangement position of the reducing agent supply unit 22 is not particularly limited, but is preferably arranged in consideration of the diffusion efficiency of the reducing agent into the exhaust gas.

次に、図２及び図３を参照して、本実施形態の排気浄化装置１０の折返部１８の構成について詳細に説明する。図２は、図１に示す本実施形態の排気浄化装置１０のＸＸ断面を矢印方向に見た図を示しており、図３は、蓋部１１を本体部１２から外して展開した状態を示す斜視図である。
この図２及び図３に示すように、排気浄化装置１０の折返部１８には、上流側排気通路１９の出口側開口１９ａ及び下流側排気通路２０の入口側開口２０ａが臨み、それぞれ断面の矩形領域の対角に位置するようになっている。 Next, with reference to FIG.2 and FIG.3, the structure of the folding | turning part 18 of the exhaust gas purification apparatus 10 of this embodiment is demonstrated in detail. FIG. 2 shows a view of the XX cross section of the exhaust purification device 10 of the present embodiment shown in FIG. 1 as viewed in the direction of the arrow, and FIG. 3 shows a state in which the lid portion 11 is removed from the main body portion 12 and deployed. It is a perspective view.
As shown in FIGS. 2 and 3, the folded-back portion 18 of the exhaust purification device 10 faces the outlet side opening 19 a of the upstream side exhaust passage 19 and the inlet side opening 20 a of the downstream side exhaust passage 20. It is located at the diagonal of the area.

上流側排気通路１９の出口側開口１９ａには、周方向に複数の開口部としての孔２５ａを有し、当該孔２５ａを介して上流側排気通路１９から折返部１８に流入する排気ガスの流れ方向を規定する第１のリング状部材２５が配設されている。
また、下流側排気通路２０の入口側開口２０ａには、周方向の一部が広く開口した開口部２７ａを有し、当該開口部２７ａを介して折返部１８から下流側排気通路２０に排気ガスを流入させる第２のリング状部材２７が配設されている。
これらのリング状部材は、本体部１２の側面１２ｂに対向する蓋部１１の内面１１ａに溶接等によって固定されるとともに、本体部１２の側面１２ｂにも接するようになっている。 The outlet side opening 19a of the upstream side exhaust passage 19 has holes 25a as a plurality of openings in the circumferential direction, and the flow of exhaust gas flowing from the upstream side exhaust passage 19 into the folded portion 18 through the holes 25a. A first ring-shaped member 25 that defines the direction is disposed.
In addition, the inlet side opening 20a of the downstream side exhaust passage 20 has an opening 27a that is partially open in the circumferential direction, and the exhaust gas passes from the folded portion 18 to the downstream side exhaust passage 20 via the opening 27a. A second ring-shaped member 27 is provided to flow in the water.
These ring-shaped members are fixed to the inner surface 11 a of the lid portion 11 facing the side surface 12 b of the main body portion 12 by welding or the like, and are also in contact with the side surface 12 b of the main body portion 12.

また、図２に示す断面の外周部２８のうち、上流側排気通路１９の出口側開口１９ａに近接する角部２８ａには第３のガイド板２９が配置されている。この第３のガイド板２９についても蓋部１１の内面１１ａに溶接等で固定されるとともに、本体部１２の側面１２ｂに接するようになっている。この第３のガイド板２９を備えることによって、第１のリング状部材２５の複数の孔２５ａを介して折返部１８に流入した排気ガスの流れが、下流側排気通路２０の入口側開口２０ａに配設された第２のリング状部材２７の開口部２７ａが臨む領域に向けられるようになっている。
図２の例では、第１のリング状部材２５と外周部２８との間を塞ぐように三枚の第３のガイド板２９が配置されている。そのため、第３のガイド板２９と第１のリング状部材２５あるいは外周部２８との間に隙間ができたとしても、排気ガスが第３のガイド板２９を越えて回り込みにくいようになっている。 In addition, a third guide plate 29 is disposed at a corner portion 28a adjacent to the outlet side opening 19a of the upstream side exhaust passage 19 in the outer peripheral portion 28 of the cross section shown in FIG. The third guide plate 29 is also fixed to the inner surface 11 a of the lid portion 11 by welding or the like and is in contact with the side surface 12 b of the main body portion 12. By providing the third guide plate 29, the flow of the exhaust gas that has flowed into the folded portion 18 through the plurality of holes 25 a of the first ring-shaped member 25 enters the inlet side opening 20 a of the downstream side exhaust passage 20. The opening 27a of the second ring-shaped member 27 provided is directed to a region facing the opening 27a.
In the example of FIG. 2, three third guide plates 29 are arranged so as to close the space between the first ring-shaped member 25 and the outer peripheral portion 28. Therefore, even if a gap is formed between the third guide plate 29 and the first ring-shaped member 25 or the outer peripheral portion 28, the exhaust gas does not easily flow around the third guide plate 29. .

また、第１のリング状部材２５の複数の孔２５ａを介して折返部１８に流入した排気ガスが流れ込む、第２のリング状部材２７の開口部２７ａが臨む領域には、排気ガスを拡散板３０に導くための第１のガイド板３１が配置されるとともに、拡散板３０を通過した排気ガスを第２のリング状部材２７の開口部２７ａへと導く第２のガイド板３２が配置されている。これらの第１のガイド板３１及び第２のガイド板３２についても蓋部１１の内面１１ａに溶接等で固定されるとともに本体部１２の側面１２ｂに接するようになっており、第１のリング状部材２５と第２のリング状部材２７との間、及び第２のリング状部材２７と外周部２８との間を塞ぐように配置されている。   Further, the exhaust gas flows into the region where the exhaust gas flowing into the folded portion 18 flows through the plurality of holes 25a of the first ring-shaped member 25 and the opening 27a of the second ring-shaped member 27 faces. A first guide plate 31 for guiding the exhaust gas to 30 is disposed, and a second guide plate 32 for guiding the exhaust gas that has passed through the diffusion plate 30 to the opening 27a of the second ring-shaped member 27 is disposed. Yes. The first guide plate 31 and the second guide plate 32 are also fixed to the inner surface 11a of the lid portion 11 by welding or the like and are in contact with the side surface 12b of the main body portion 12 to form a first ring shape. It arrange | positions so that between the member 25 and the 2nd ring-shaped member 27 and between the 2nd ring-shaped member 27 and the outer peripheral part 28 may be block | closed.

また、これらの第１のガイド板３１と第２のガイド板３２とによって規定される排気ガスの流路には、流路面積が狭められる絞り部３３が形成されており、当該絞り部３３に拡散板３０が配置されている。したがって、排気ガスは絞り部３３を通過する際に流速が早められるようになっており、この流速が早められる状態において拡散板３０を通過するために、拡散板３３の上流側で排気ガス中に噴射供給された還元剤が効率的に混合拡散されるようになっている。   The exhaust gas flow passage defined by the first guide plate 31 and the second guide plate 32 is formed with a throttle portion 33 that narrows the flow passage area. A diffusion plate 30 is arranged. Therefore, the exhaust gas has a flow velocity that is increased when it passes through the throttle 33, and in order to pass through the diffusion plate 30 in a state in which this flow velocity is increased, the exhaust gas enters the exhaust gas upstream of the diffusion plate 33. The reducing agent supplied by injection is mixed and diffused efficiently.

さらに、拡散板３０の上流側の排気通路の途中の、外周部２８の角部２８ｂの近傍には、排気ガスの流れ方向に沿って配置された三枚の整流板３４配置されている。この整流板３４は、第１のリング状部材２５の複数の孔２５ａから折返部１８に流入した排気ガスが、角部２８ｂ側を通って第２のリング状部材２７の開口部２７ａに流れる際に、外側を通過する排気ガスの流速が内側を通過する排気ガスの流速に比べて相対的に早くなることを防ぐようになっている。したがって、排気ガスが拡散板３０に到達する際には排気ガスの流れが均一にされ、その後、下流側排気通路２０へと流入させられる。   Further, in the middle of the exhaust passage on the upstream side of the diffusion plate 30, three rectifying plates 34 arranged along the exhaust gas flow direction are arranged in the vicinity of the corner portion 28 b of the outer peripheral portion 28. The rectifying plate 34 is formed when the exhaust gas flowing into the folded portion 18 from the plurality of holes 25a of the first ring-shaped member 25 flows into the opening 27a of the second ring-shaped member 27 through the corner portion 28b side. In addition, the flow rate of the exhaust gas passing through the outside is prevented from becoming relatively faster than the flow rate of the exhaust gas passing through the inside. Therefore, when the exhaust gas reaches the diffusion plate 30, the flow of the exhaust gas is made uniform, and then flows into the downstream exhaust passage 20.

この排気ガスの流速を均一にするための整流板については、本体部１２の側面１２ｂ又は蓋部１１の内面１１ａに溶接等で固定されている一方、固定されていない側の面には接していてもよく、あるいは接しないようになっていても構わない。   The rectifying plate for making the flow rate of the exhaust gas uniform is fixed to the side surface 12b of the main body portion 12 or the inner surface 11a of the lid portion 11 by welding or the like, but is in contact with the non-fixed side surface. It does not matter if you don't touch it.

図４は、図２に示す本実施形態の排気浄化装置１０の折返部１８のように構成した場合の排気ガスの流路を図示したものである。図４中、領域Ａが排気ガスが流れる領域を示している。
上述のように、第１のリング状部材２５、第２のリング状部材２７、第３のガイド板２９、第１のガイド板３１及び第２のガイド板３２は、それぞれ蓋部１１の内面１１ａに固定されるとともに本体部１２の側面１２ｂに接した遮蔽板となっており、これらの遮蔽板によって排気ガスが流れる流路が規定されている。本実施形態の排気浄化装置１０の構成において、上流側排気通路１９の出口側開口１９ａから下流側排気通路２０の入口側開口２０ａへと直線的に流れ方向を規定していないのは、排気浄化装置の外形を大型化することなく拡散板等の還元剤拡散部やその上流側に配置される還元剤供給部の配置スペースを確保するとともに、還元剤が排気ガス中に混合拡散されやすくなるように十分な距離を稼ぐためである。 FIG. 4 illustrates the flow path of the exhaust gas when configured as the folded portion 18 of the exhaust purification device 10 of the present embodiment shown in FIG. In FIG. 4, a region A indicates a region through which exhaust gas flows.
As described above, the first ring-shaped member 25, the second ring-shaped member 27, the third guide plate 29, the first guide plate 31, and the second guide plate 32 are each in the inner surface 11 a of the lid portion 11. The shielding plate is in contact with the side surface 12b of the main body 12 and the flow path through which the exhaust gas flows is defined by these shielding plates. In the configuration of the exhaust purification device 10 of the present embodiment, the flow direction is not regulated linearly from the outlet side opening 19 a of the upstream side exhaust passage 19 to the inlet side opening 20 a of the downstream side exhaust passage 20. Without reducing the size of the device, the space for the reducing agent diffusion part such as the diffusion plate and the reducing agent supply part arranged upstream is secured and the reducing agent is easily mixed and diffused into the exhaust gas. This is to earn enough distance.

このように構成された本実施形態の排気浄化装置１０では、第１のリング状部材２５の複数の孔２５ａから折返部１８に流れ込んだ排気ガスは、途中、流速のばらつきが生じやすい角部２８ｂ付近に配置された整流板３４によって流速が均一にされて拡散板３０に向かって進行する。そして、拡散板３０の上流側で還元剤が還元剤供給部２２から排気ガス中に噴射供給され、この還元剤が混合された排気ガスが拡散板３０を通過することによって、還元剤が排気ガス中で気化され、混合が促進される。その後、排気ガスが第２のリング状部材２７の開口部２７ａを介して下流側排気通路２０に導かれる結果、下流側排気通路２０中に配設されたＮＯX還元触媒２３に対して還元剤を拡散させて流入させることができるようになっている。 In the exhaust purification device 10 of the present embodiment configured as described above, the exhaust gas flowing into the folded portion 18 from the plurality of holes 25a of the first ring-shaped member 25 has a corner portion 28b in which a variation in the flow velocity is likely to occur in the middle. The flow rate is made uniform by the rectifying plate 34 arranged in the vicinity, and the flow proceeds toward the diffusion plate 30. Then, the reducing agent is injected and supplied into the exhaust gas from the reducing agent supply unit 22 on the upstream side of the diffusion plate 30, and the exhaust gas mixed with the reducing agent passes through the diffusion plate 30. Vaporizes in and promotes mixing. Thereafter, the exhaust gas is guided to the downstream exhaust passage 20 through the opening 27 a of the second ring-shaped member 27, so that the reducing agent is reduced with respect to the NO X reduction catalyst 23 disposed in the downstream exhaust passage 20. Can be diffused and introduced.

また、本実施形態の排気浄化装置１０では、本体部１２に蓋部１１を取り付けることにより内部空間を折返部１８として形成した構成であるために、折返部１８内にリング状部材やガイド板、拡散板等を容易に配設することができるようになっている。   Further, in the exhaust purification device 10 of the present embodiment, since the inner space is formed as the folded portion 18 by attaching the lid portion 11 to the main body portion 12, a ring-shaped member, a guide plate, A diffusion plate or the like can be easily disposed.

２．変形例
これまで説明した排気浄化装置の構成は、言うまでもなく構成例の一つに過ぎないものであり、これ以外にも種々の変形が可能である。
例えば、図５に示すように、第１のリング状部材２５、第２のリング状部材２７、第３のガイド板２９、第１のガイド板３１及び第２のガイド板３２を、蓋部１１側ではなく、本体部１２の側面１２ｂに溶接等で固定するようにしてもよい。 2. Modifications The configuration of the exhaust gas purification apparatus described so far is, of course, only one of the configuration examples, and various other modifications are possible.
For example, as shown in FIG. 5, the first ring-shaped member 25, the second ring-shaped member 27, the third guide plate 29, the first guide plate 31, and the second guide plate 32 are connected to the lid portion 11. You may make it fix to the side surface 12b of the main-body part 12 by welding etc. instead of the side.

また、ガイド板等の配置位置についても排気ガスの流れに応じて適宜設計することができる。図６は、ガイド板の別の配置例を示したものであり、本体部１２の側面１２ｂ及び蓋部１１の内面１１ａにそれぞれに接するガイド板３６ａ、３６ｂを用いて排気ガスの流路を規定し、リング状部材を用いないで構成した例である。この例では、二枚の円弧状のガイド板３６ａ、３６ｂによって排気ガスが流れ込まない領域（図中の領域Ｂ）を形成する一方、上流側排気通路１９から流入してくる排気ガスを拡散板３０に導くとともに、拡散板３０を通過した排気ガスを下流側排気通路２０の入口側開口２０ａに導くように構成されている。   Further, the arrangement position of the guide plate and the like can be appropriately designed according to the flow of the exhaust gas. FIG. 6 shows another example of the arrangement of the guide plates, and the flow path of the exhaust gas is defined using the guide plates 36a and 36b in contact with the side surface 12b of the main body 12 and the inner surface 11a of the lid portion 11, respectively. And it is the example comprised without using a ring-shaped member. In this example, the two arcuate guide plates 36a and 36b form a region where the exhaust gas does not flow (region B in the figure), while the exhaust gas flowing in from the upstream exhaust passage 19 is diffused by the diffusion plate 30. The exhaust gas that has passed through the diffusion plate 30 is guided to the inlet side opening 20 a of the downstream side exhaust passage 20.

また、折返部内において下流側排気通路の入口側開口に配置するリング状部材の代わりに、下流側排気通路２０の入口側開口２０ａを覆うようにして配置されるガイド蓋部材４０を備えた構成を図７の参考図として示す。
このガイド蓋部材４０は、下流側排気通路２０の入口側開口２０ａの流路面積よりも小さい排気ガスの導入口４０ａを有するとともに、当該導入口４０ａから連続する直線状の部分４１が、図２の例における第２のガイド板３２と同様の機能を果たすガイド部として構成されている。また、導入口４０ａには還元剤拡散部としての拡散板３０が配置されており、下流側排気通路２０の入口側開口２０ａに流入する排気ガスが、当該拡散板３０を通過するようになっている。 In addition, a configuration including a guide lid member 40 disposed so as to cover the inlet side opening 20a of the downstream side exhaust passage 20 instead of the ring-shaped member disposed in the inlet side opening of the downstream side exhaust passage in the folded portion. It shows as a reference figure of FIG.
The guide lid member 40 has an exhaust gas introduction port 40a smaller than the flow passage area of the inlet side opening 20a of the downstream side exhaust passage 20, and a linear portion 41 continuous from the introduction port 40a is shown in FIG. It is comprised as a guide part which fulfill | performs the function similar to the 2nd guide plate 32 in the example of. In addition, a diffusion plate 30 as a reducing agent diffusing portion is disposed at the introduction port 40a, and the exhaust gas flowing into the inlet side opening 20a of the downstream side exhaust passage 20 passes through the diffusion plate 30. Yes.

このようなガイド蓋部材４０を用いることにより、排気ガスの導入口４０ａが絞り部として機能し、当該絞り部で排気ガスの流速が高められると同時に拡散板３０を通過するため、排気ガス中への還元剤の混合が促進される。また、拡散板３０を通過した排気ガスは、下流側排気通路２０の入口側開口２０ａに分散して流れ込みやすくなる。   By using such a guide lid member 40, the exhaust gas introduction port 40 a functions as a throttle part, and the flow rate of the exhaust gas is increased at the throttle part and at the same time passes through the diffusion plate 30. Mixing of the reducing agent is promoted. Further, the exhaust gas that has passed through the diffusion plate 30 is easily dispersed and flows into the inlet side opening 20 a of the downstream side exhaust passage 20.

なお、下流側の排気通路に配置されるＮＯX還元触媒２３以外の、上流側酸化触媒、パティキュレートフィルタ、下流側酸化触媒については適宜省略することができる。この場合、上流側の排気通路にスペースが確保されるのであれば、上流側の排気通路に還元剤供給部としての噴射ノズルや還元剤噴射弁を備えることもできる。還元剤供給部が上流側の排気通路に配置される場合であっても、還元剤を含む排気ガスを、所定のガイド部及び還元剤拡散部が配置された折返部を通過させて下流側の排気通路に流入させることにより、還元剤の気化と混合が促進され、排気ガス中に還元剤を拡散させた状態で下流側の排気通路に配置されたＮＯX還元触媒に対して流入させることができる。 Note that the upstream side oxidation catalyst, the particulate filter, and the downstream side oxidation catalyst other than the NO x reduction catalyst 23 arranged in the downstream exhaust passage can be omitted as appropriate. In this case, if a space is secured in the upstream exhaust passage, the upstream exhaust passage may be provided with an injection nozzle or a reducing agent injection valve as a reducing agent supply unit. Even when the reducing agent supply unit is disposed in the upstream exhaust passage, the exhaust gas containing the reducing agent is allowed to pass through the folded portion where the predetermined guide unit and the reducing agent diffusion unit are disposed, and the downstream side. by flowing into the exhaust passage, is promoted mixed with vaporization of the reducing agent, it is made to flow against NO X reduction catalyst disposed in an exhaust passage downstream in a state where the reducing agent is diffused in the exhaust gas it can.

本実施形態の排気浄化装置の構成を説明するための図である。It is a figure for demonstrating the structure of the exhaust gas purification apparatus of this embodiment. 本実施形態の排気浄化装置の折返部の構成を説明するための断面図である。It is sectional drawing for demonstrating the structure of the folding | turning part of the exhaust gas purification apparatus of this embodiment. 本実施形態の排気浄化装置の折返部の構成を説明するための斜視図である。It is a perspective view for demonstrating the structure of the folding | turning part of the exhaust gas purification apparatus of this embodiment. 折返部内での排気ガスの流れを説明するための図である。It is a figure for demonstrating the flow of the exhaust gas in a folding | turning part. 折返部の別の構成例を示す図である。It is a figure which shows another structural example of a folding | turning part. ガイド部の別の構成例を示す図である。It is a figure which shows another structural example of a guide part. ガイド蓋部材を用いた構成例を示す図（参考図）である。It is a figure (reference drawing) which shows the structural example using a guide lid member. 従来の排気浄化装置の構成を説明するための図である。It is a figure for demonstrating the structure of the conventional exhaust gas purification apparatus.

符号の説明Explanation of symbols

１０：排気浄化装置、１１：蓋部、１１ａ：蓋部の内面、１２：本体部、１２ａ・１２ｂ：本体部の側面、１３：排気流入部、１４：排気排出部、１５ａ：フランジ部、１５ｂ・１５ｃ：取付フランジ部、１６：孔、１７：拡張室、１８：折返部、１９：上流側排気通路、１９ａ：出口側開口、２０：下流側排気通路、２０ａ：入口側開口、２１：酸化触媒、２２：還元剤供給部、２３：ＮＯX還元触媒、２４：酸化触媒、２５：第１のリング状部材、２５ａ：孔、２６：パティキュレートフィルタ、２７：第２のリング状部材、２７ａ：開口部、２８：外周部、２８ａ・２８ｂ：角部、２９：第３のガイド板、３０：拡散板、３１：第１のガイド板、３２：第２のガイド板、３３：絞り部、３４：整流板、３６ａ・３６ｂ：ガイド板、４０：ガイド蓋部剤、４０ａ：導入口、４１：直線状部分 10: Exhaust gas purification device, 11: Lid portion, 11a: Inner surface of lid portion, 12: Main body portion, 12a and 12b: Side surface of main body portion, 13: Exhaust gas inflow portion, 14: Exhaust gas discharge portion, 15a: Flange portion, 15b 15c: mounting flange portion, 16: hole, 17: expansion chamber, 18: folded portion, 19: upstream exhaust passage, 19a: outlet opening, 20: downstream exhaust passage, 20a: inlet opening, 21: oxidation the catalyst, 22: reducing agent supply portion, 23: NO X reduction catalyst 24: oxidation catalyst, 25: a first ring-shaped member, 25a: hole, 26: particulate filter, 27: second ring-shaped member, 27a : Opening, 28: outer peripheral part, 28a and 28b: corner, 29: third guide plate, 30: diffusion plate, 31: first guide plate, 32: second guide plate, 33: throttle part, 34: current plate, 36a, 36b: guide plate, 40 Guide lid agents, 40a: inlet, 41: straight portion

Claims (5)

折返部を有する排気通路と、前記折返部又は前記折返部よりも上流側の排気通路に配置され前記排気通路中に還元剤を供給する還元剤供給部と、前記折返部よりも下流側の排気通路に配置され窒素酸化物を前記還元剤を用いて還元浄化する還元触媒と、を備えた排気浄化装置において、
前記排気浄化装置の筐体は、前記上流側の排気通路及び前記下流側の排気通路が収容された本体部と、前記上流側の排気通路の出口側開口及び前記下流側の排気通路の入口側開口が設けられた前記本体部に装着された蓋部と、を含み、前記折返部は前記本体部及び前記蓋部によって囲まれる空間からなっており、
蓋部内の前記出口側開口を含む面、又は当該面と対向する蓋部内面に、開口部を有する第１のリング状部材、開口部を有する第２のリング状部材、第１のガイド板、第２のガイド板、及び拡散板を接触して備え、前記第１のリング状部材は前記上流側の排気通路の前記出口側開口に連接され、前記第２のリング状部材は前記下流側の排気通路の前記入口側開口に連接されて設置され、
前記第１のガイド板は前記第１のリング状部材の前記開口部から流出される前記排気ガスを前記拡散板に導き、前記第２のガイド板は前記拡散板を通過した前記排気ガスを前記第２のリング状部材の前記開口部に導き、前記拡散板は前記ガイド板によって導かれる前記排気ガスの流れを前記排気ガス中への前記還元剤の混合を促進させる、ことを特徴とする排気浄化装置。 An exhaust passage having a turn-up portion, a reductant supply portion that is arranged in the turn-up portion or an exhaust passage upstream of the turn-up portion and supplies a reducing agent into the exhaust passage, and an exhaust downstream of the turn-up portion In an exhaust purification device comprising a reduction catalyst disposed in a passage and reducing and purifying nitrogen oxides using the reducing agent,
The casing of the exhaust purification device includes a main body portion in which the upstream exhaust passage and the downstream exhaust passage are accommodated, an outlet side opening of the upstream exhaust passage, and an inlet side of the downstream exhaust passage. A lid part mounted on the main body part provided with an opening, and the folding part is composed of a space surrounded by the main body part and the lid part,
A first ring-shaped member having an opening, a second ring-shaped member having an opening, a first guide plate, on a surface including the outlet-side opening in the lid, or an inner surface of the lid facing the surface. A second guide plate and a diffusion plate in contact with each other, wherein the first ring-shaped member is connected to the outlet-side opening of the upstream exhaust passage, and the second ring-shaped member is disposed on the downstream side. It is connected to the inlet side opening of the exhaust passage and is installed,
The first guide plate guides the exhaust gas flowing out from the opening of the first ring member to the diffusion plate, and the second guide plate transfers the exhaust gas that has passed through the diffusion plate to the diffusion plate. led to the opening of the second ring-shaped member, the diffusion plate makes facilitate the mixing of the reducing agent of the flow of the exhaust gas guided by the guide plate to the exhaust gas, it is characterized in the exhaust Purification equipment. 前記排気浄化装置において、前記蓋部における前記排気ガスの流れが、前記上流側の排気通路から、前記出口側開口を経て、前記第１のリング状部材に流入し、前記第１のリング状部材の前記開口部を経て流出し、前記第１のガイド板により導かれて前記拡散板を通過した後、前記第２のガイド板により導かれて前記第２のリング状部材の前記開口部に達し、前記開口部を経て前記第２のリング状部材に流入し、前記第２のリング状部材から前記下流側の排気通路の前記入口側開口を経て、前記下流側の排気通路に流入する、ことを特徴とする請求項１に記載の排気浄化装置。 In the exhaust purification apparatus, the flow of the exhaust gas in the lid portion flows from the upstream exhaust passage through the outlet side opening into the first ring member, and the first ring member And then flows through the opening, is guided by the first guide plate and passes through the diffusion plate, and is then guided by the second guide plate and reaches the opening of the second ring-shaped member. And flows into the second ring-shaped member through the opening, and flows into the downstream exhaust passage from the second ring-shaped member through the inlet opening of the downstream exhaust passage. The exhaust emission control device according to claim 1. 前記還元剤供給部は前記折返部内の前記拡散板の上流側に配置されるとともに、前記第１のリング状部材と前記蓋部の外周部との間を塞ぐ第３のガイド板をさらに備え、前記第１のリング状部材から流出した前記排気ガスを、前記第２のリング状部材の前記開口部に導くことを特徴とする請求項１又は２に記載の排気浄化装置。 The reducing agent supplying unit is disposed on the upstream side of the diffusion plate of the fold-back portion Rutotomoni, further comprising a third guide plate which closes the space between the outer peripheral portion of the first ring-shaped member and the lid, The exhaust emission control device according to claim 1 or 2 , wherein the exhaust gas flowing out from the first ring-shaped member is guided to the opening of the second ring-shaped member . 前記排気ガスの流れの途中に配置され、前記排気ガスを前記拡散板に均一に導くための整流板を、さらに備えることを特徴とする請求項１〜３のいずれか一項に記載の排気浄化装置。 The exhaust gas purification according to any one of claims 1 to 3 , further comprising a rectifying plate that is disposed in the middle of the flow of the exhaust gas and uniformly guides the exhaust gas to the diffusion plate. apparatus. 前記第１のリング状部材が連接する前記上流側の排気通路の前記出口側開口と、前記第２のリング状部材が連接する前記下流側の排気通路の前記入口側開口が蓋部断面図の矩形領域の対角に位置するように配置されることを特徴とする請求項１〜４のいずれか一項に記載の排気浄化装置。 The outlet side opening of the upstream exhaust passage to which the first ring-shaped member is connected and the inlet side opening of the downstream exhaust passage to which the second ring-shaped member are connected are shown in a cross-sectional view of the lid portion. The exhaust emission control device according to any one of claims 1 to 4, wherein the exhaust gas purification device is disposed so as to be located diagonally to the rectangular region .
JP2007133124A 2007-05-18 2007-05-18 Exhaust purification device Active JP5132187B2 (en)

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EP08721165.2A EP2151560B1 (en) 2007-05-18 2008-03-03 Exhaust emission purifier
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EP2151560A4 (en) 2011-11-02
US20100146950A1 (en) 2010-06-17

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